*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
html,body{
    height: 100%;
    background-image:url("../img/背景.jpg") ;
    background-position:center center ;
    background-size:cover;
    background-repeat:no-repeat;
}
.nav{
    width:100%;
    height:50px;
    background-color:rgba(51,51,51,.4);
    color:#fff;
    display:flex;
    justify-content: left;
    align-items: center;
}
.nav img{
    height: 40px;
    margin-left: 30px;
    margin-right: 10px;
    border-radius: 50%;
}
.nav .spacer{
    width: 70%;
}
.nav a{
    color:#fff;
    text-decoration: none;
    padding: 0 10px;
}
.container{
    height: calc(100% - 50px);
    width:1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.container-left{
    height:100%;
    width:300px;
}
.container-right{
    height: 100%;
    width:895px;
    overflow: auto;
    background-color:rgba(255,255,255,.8);
    border-radius: 10px;
}
.card{
    background-color:rgba(255,255,255,.8);
    border-radius:10px;
    padding: 30px;
}
.card .avatar{
    margin-left: 50px;
    width: 140px;
    border-radius: 50%;
}
.card h3{
    text-align: center;
    padding: 30px;
}
.card a{
    display: block;
    text-align: center;
    color: #999;
    text-decoration: none;
    padding: 10px;
}
.card .counter{
    padding: 5px;
    display: flex;
    justify-content: space-around;
}
